Padrig and Friend,
I do believe style, taste and aesthetics are "learn-able," at least they can be educated to some degree. Sure, there are those who have innate abilities or understanding or a "sense" of aesthetic proportion and balance, but there must be more to it than just an innate (unconscious) ability. Even those who seem to have a sense of grace have to educate themselves about it to some degree.
So the question seems to be how to go about educating ourselves in this regards. The way many of us seem to go about it is by (more or less) blind luck. We put our best efforts forward and stand back when the job is done and ask, is it good? Sometimes we're too close to our own creative processes to make a reasonable assessment. Sometimes those we check in with and ask, "hey, what do you think, how does she look," are too close to us too and may not be as frank as we would wish. Of course, the market is (more or less) objective. If the stuff we make sells we might be on a good track, so we pursue it. If it doesn't, back to the drawing board.
Although this sink or swim approach is common, it doesn't mean it's the best (or only) one. Another many of us take up is the what looks good to us and how did they do that? This approach is common in art studies. You know, where the art students all paint copies of the masters, for instance. Indeed, a whole lot can be learned in this manner. (So Ray, Tai, Bruce, Ed and a host of you masters...look out we're studying YOU!)
Along with these studies of the masters, the art classes take their students on journeys of discovery, not only of technique, but composition, values and principles too. They study things like color theory, perspective, texture, tone, value, symbology, historic trends, and a host of other stuff (this is where I reveal I'm in way over my head).
Anyway, as knife makers, we certainly strive to master technique, without which we're fairly crippled. This can keep us pretty busy too. We need to not only learn how to transform and combine blade, handle and fitting materials, we often need to learn how to create the very mean to apply these techniques. So we delve into setting up our shops and studios too. We then need to figure out how to package our creations and market them. So sheaths and shows and sites and the like will, at some point, consume our time. Stuff like photography and makers marks and a host of other stuff are likely to come our way as abilities we'll need to fulfill too.
Anyway, technique aside, every now and then, some savvy person might ask, "say, what makes a knife beautiful anyway?" And on we go to our study of aesthetics. The line and curve, positive and negative spaces, texture and trim, balance and proportion, etc. I believe, inherent in the asking, we are putting out feet more firmly on the path of understanding and application. Making ourselves familiar with some of the principles of graphic (2 dimensional) and 3 dimentional design would not be out of order. Studying the human hand and its use of tools and the blade naturally is of interest. Studying forms and patterns in nature can be a real guide on this journey to taste and style. Studying trends and historic patterns, the masters (past and present) and associating with guilds and clubs (online ones too

) are a great way to broaden our exposure, thus our understanding.
BTW, did you see this thread on knife making and the golden mean?
http://www.bladeforums.com/forums/showthread.php?t=476434
All the best, Phil